We present a systems theory approach to the proof of a result bounding the required level of added quantum noise in a phase-insensitive quantum amplifier. We also present a synthesis procedure for constructing a quantum optical phaseinsensitive quantum amplifier which adds the minimum level of quantum noise and achieves a required gain and bandwidth. This synthesis procedure is based on a singu...

Broad-band microwave packaging of a travelingwave amplifier with an on-chip bandwidth of 2–50 GHz is described. Techniques to reduce overall insertion losses and to extend the low-frequency cutoff of the amplifier while maintaining gain-flatness are discussed. The packaged amplifier modules exhibit excellent performance from 100 kHz to 50 GHz. They are demonstrated as modulator drivers and rece...

We denote by A the subclass of H a, 1 with the usual normalization f 0 f ′ 0 − 1 0, and denote by A the subclass ofA satisfying the condition h z h′ z / 0 for z ∈ U \ {0}. Let f and F be members of H. The function f is said to be subordinate to F, or F is said to be superordinate to f, if there exists a functionw analytic in Uwithw 0 0 and |w z | < 1 for z ∈ U and such that f z g w z z ∈ U . In...

Telecommunication networks now days require high speed and transmission capacity. Such a trend is present in Kosovo too. The overall backbone transmission technology in Kosovo is based on fiber optic. To reach this requirement it is necessary to develop and use optical networks which are based on advanced optical technologies, such as WDM/DWDM transmitting technology and different amplifiers. H...